Aufgrund von Fehlern, habe ich die long Time Version 4.9 noch einmal installiert inkl Erweiterungen usw.
Leider kommt immernoch eine Fehlermeldung bei var/logs..

[2021-06-08 04:48:19] request.INFO: Matched route "tl_page.1.root". {"route":"tl_page.1.root","route_parameters":{"_to ken_check":true,"_controller":"Contao\\FrontendInd ex::renderPage","_scope":"frontend","_locale":"de" ,"pageModel":"[object] (Contao\\PageModel: {})","_route":"tl_page.1.root"},"request_uri":"htt ps://www.haus-sandersfeld.de/preview.php/","method":"GET"} []
[2021-06-08 04:48:19] security.INFO: Populated the TokenStorage with an anonymous Token. [] []
[2021-06-08 04:48:19] request.CRITICAL: Uncaught PHP Exception ErrorException: "Catchable Fatal Error: Object of class Contao\PageModel could not be converted to string" at /mnt/web001/e1/50/51057250/htdocs/contao2021/vendor/contao/core-bundle/src/Resources/contao/pages/PageRoot.php line 73 {"exception":"[object] (ErrorException(code: 0): Catchable Fatal Error: Object of class Contao\\PageModel could not be converted to string at /mnt/web001/e1/50/51057250/htdocs/contao2021/vendor/contao/core-bundle/src/Resources/contao/pages/PageRoot.php:73)"} []

Momentan weiss ich nicht mehr was ich machen kann. Composer wurde upgedatet, sowie der Anwendungscache Composer Cache erneuert.
Hoster ist Strato

Folgende Erweiterungen wurden verwendet..
"bugbuster/contao-visitors-bundle": "^1.6",
"cgo-it/contao-aeo-bundle": "^4.1",
"codefog/contao-cookiebar": "^2.3",
"contao/calendar-bundle": "4.9.*",
"contao/comments-bundle": "4.9.*",
"contao/conflicts": "*@dev",
"contao/faq-bundle": "4.9.*",
"contao/listing-bundle": "4.9.*",
"contao/manager-bundle": "4.9.*",
"contao/news-bundle": "4.9.*",
"contao/newsletter-bundle": "4.9.*",
"delahaye/dlh_googlemaps": "^2.4",
"do-while/contao-backupdb-bundle": "^1.4",
"lionel/newsletter-export": "^4.0"

weiss noch jemand was ich tun kann?